问题描述

java swing 一个窗口打开新创口 加上go()程序就死掉了

import javax.swing.*;

import java.awt.Rectangle;
import java.awt.event.*;

public class Swing7 extends JFrame implements ActionListener {
JButton jb = new JButton();

public Swing7() {    this.setTitle(""Java——"");    jb.setText(""确定"");    jb.setMnemonic('a');    this.add(jb);    this.setBounds(200 300 250 300);    this.setVisible(true);    jb.addActionListener(this); //由于Swing7实现了ActionListener接口，所以给jb添加的ActionListener就是Swing7实例。}public void actionPerformed(ActionEvent e) {// 实现ActionListener接口的actionPerformed接口。    yidengjiang frame=new yidengjiang();    frame.setVisible(true);}public static void main(String args[]) {    Swing7 s = new Swing7();}

}

import java.awt.*;
import java.awt.event.*;
import java.util.Random;

import javax.swing.*;

public class yidengjiang extends JFrame implements ActionListener {

/** *  */private static final long serialVersionUID = -8560277451929244119L;JTextField tf = new JTextField();JButton b1 = new JButton(""开始"");JButton b2 = new JButton(""停止"");boolean isGo = false;String path = ""223.jpg"";ImageIcon background = new ImageIcon(path);JTextArea jiang1= new JTextArea();int choujiangcishu=1;public yidengjiang() {    this.getContentPane().setLayout(null);    Dimension srcDim = Toolkit.getDefaultToolkit().getScreenSize();      System.out.println(srcDim.width+""   ""+srcDim.height);    this.setExtendedState(JFrame.MAXIMIZED_BOTH);    this.getContentPane().add(tf);    this.getContentPane().add(b1);    ImageIcon background = new ImageIcon(path);// 背景图片    JLabel jlbg = new JLabel(background);// 把背景图片显示在一个标签里面    jlbg.setBounds(0 0 srcDim.width srcDim.height);// 把标签的大小位置设置为图片刚好填充整个面板    JPanel imagePanel = (JPanel) this.getContentPane();    imagePanel.setOpaque(false);    this.getLayeredPane().add(jlbg new Integer(Integer.MIN_VALUE));    tf.setFont(new Font(""Courier"" Font.PLAIN 110));    tf.setHorizontalAlignment(JLabel.CENTER);    tf.setOpaque(false);    //tf.setBackground(Color.red);// 按钮红色背景    tf.setEditable(false);//不可编辑    tf.setBorder(BorderFactory.createEmptyBorder());//无边框    tf.setBounds(srcDim.width/2-srcDim.width/3/2 srcDim.height/2+srcDim.height/10/2 srcDim.width/3 srcDim.height/10);    b1.setBounds(0000);    b2.setBounds(0000);    jiang1.setBounds(srcDim.width/30 srcDim.height/20800800);    jiang1.setOpaque(false);    jiang1.setFont(new Font(""Courier""Font.PLAIN22));    jiang1.setEditable(false);    this.getContentPane().add(tf);    this.getContentPane().add(b1);    this.getContentPane().add(b2);    this.getContentPane().add(jiang1);    b1.setActionCommand(""start"");    b1.addActionListener(this);    b2.addActionListener(this);    SymListener sy = new SymListener();    b1.registerKeyboardAction(syKeyStroke.getKeyStroke(KeyEvent.VK_SPACE 0) JComponent.WHEN_IN_FOCUSED_WINDOW);     b2.registerKeyboardAction(syKeyStroke.getKeyStroke(KeyEvent.VK_SPACE 0) JComponent.WHEN_IN_FOCUSED_WINDOW);     //jButton.setMnemonic(KeyEvent.VK_ENTER);    b2.setEnabled(false);    super.setUndecorated(true);// 无标题栏    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    this.setLocation(0 0);    Cursor cu = new Cursor(Cursor.HAND_CURSOR);    this.setCursor(cu);    this.setVisible(true);    tf.setText(""888888"");    go();}    public void go() {    while (true) {        if (isGo == true) {            String s = """";            Random rand = new Random();            for (int j = 1; j <= 1; j++) {                int i = (int) (Math.random()*260000+1);//设定奖项总数                if (i < 10) {                    s = s + ""00000"" + i;                } else if(i<100 & i>=10)                 {                    s = s + ""0000"" + i;                }else if(i<1000 & i>=100)                 {                    s = s + ""000"" + i;                }else if(i<10000 & i>=1000)                 {                    s = s + ""00"" + i;                }else if(i<100000 & i>=10000)                 {                    s = s + ""0"" + i;                }else                {                    s = s +  i;                }            }            tf.setText(s);        }        try {            Thread.sleep(10);        } catch (java.lang.InterruptedException e) {            e.printStackTrace();        }    }}public void actionPerformed(ActionEvent e) {    String s = e.getActionCommand();    if (s.equals(""start"")) {        isGo = true;        b1.setEnabled(false);        b2.setEnabled(true);    } else {        isGo = false;        jiang1.setText(jiang1.getText()+""n""+tf.getText());        b2.setEnabled(false);        b1.setEnabled(true);    }}/*public static void main(String[] args)  {    Dimension srcDim = Toolkit.getDefaultToolkit().getScreenSize();     ImgUtil image =new ImgUtil();    image.createThumb(""3.png""223.jpg""(int)srcDim.getWidth() (int)srcDim.getHeight());    new yidengjiang();} */   class SymListener implements ActionListener {    public void actionPerformed(ActionEvent e) {    Object obj = e.getSource();    if (obj == b1) {            isGo = true;            b1.setEnabled(false);            b2.setEnabled(true);    } else if (obj == b2) {        isGo = false;        operdata aaa =new operdata();        String bb= aaa.getuserdata(tf.getText());        jiang1.setText(jiang1.getText()+""n""+""""+(choujiangcishu++)+"":  ""+tf.getText()+bb);        b2.setEnabled(false);        b1.setEnabled(true);    }    }    }

}

解决方案

SWING是单线程的，需要将循环放到单独的线程中执行。修改成这个：

new Thread(){            public void run() {go();};        }.start();

解决方案二：
new Thread(){

                public void run() {go();};        }.start();

解决方案三：
你的go方法中的while不是死循环吗